Troubleshooting - Yamaha YJ125S Service Manual

EAS00774

TROUBLESHOOTING

The battery is not being charged.
Check:
1. main fuse
2. battery
3. charging voltage
4. stator coil resistance
5. wiring connections
(of the entire charging system)
NOTE:
8 Before troubleshooting, remove the follow-
ing part(s):
1. Rear carrier
2. Side cover (right )
3. Cover
4. Battery cover
8 Troubleshoot with the following special
tool(s).
Engine tachometer
90890-03113 (YU-08036-C)
Pocket tester
90890-03132 (YU-03112-C)
EAS00738
1. Main fuse
8Check the fuse for continuity.
Refer to "CHECKING THE FUSE" in
chapter 3.
8Is the fuse OK?
YES NO
Replace the fuse.
CHARGING SYSTEM
EAS00739
2. Battery
8Check the condition of the battery.
Refer to "CHECKING AND CHARGING
THE BATTERY" in chapter 3.
Minimum open-circuit voltage
12.8 V or more at 20°C
8Is the battery OK?
YES
EAS00775
3. Charging voltage
8Connect the engine tachometer to the
spark plug lead of cylinder.
8Connect the pocket tester (DC 20 V) to
the battery as shown.
Positive tester probe
terminal
Negative tester probe
terminal
8Start the engine and let it run at approxi-
mately 5,000 r/min.
8Measure the charging voltage.
Charging voltage
14 V at 5000r/min
7-25
ELEC
NO
8Clean the battery termi-
nals.
8Recharge or replace the
battery.
positive battery
negative battery
DC20V
- +